Poly Mailers and Courier Bags
Poly Mailers and Courier Bags
Courier Bag / Mail Envelope
A courier bag is a poly mailer mail envelope for express and mail services, made from HDPE or LDPE and closed with self seal hot-melt adhesive.
Product Overview
A courier bag is a poly mailer mail envelope for express and mail services, made from HDPE or LDPE and closed with self seal hot-melt adhesive. Edges are joined by heat-seal welding and the film is moisture-proof and waterproof in transparent or clear and solid colours. Thickness runs from 1.2 Mil to 4.0 Mil or 30 Micron to 110 Micron, with size and printed design made to your drawing for mailing shipping and packaging.
Key Benefits
- Keeps apparel documents and parcels dry in transit with moisture-proof waterproof HDPE or LDPE film
- Closes without tape using self seal hot-melt strong adhesive so packing stations seal parcels faster
- Selects thickness from 30 Micron to 110 Micron to balance postage weight against puncture protection
- Holds through sorting and handling with heat-seal welded edges that resist splitting in express networks
- Matches your product cube with customized sizes that reduce void fill and excess dimensional weight
- Carries your brand on the parcel with base colours and custom printing made to your design
Problems It Solves
- Oversized cartons add postage and storage cost on every lightweight parcel you ship
- Paper envelopes absorb water in transit while waterproof poly film keeps contents dry
- Tape sealed packs slow packing lines where self seal adhesive closes bags in one fold
- Weak side seams split during sorting while heat-seal welding holds the edge closed
- Stock sizes waste film and freight where customized sizes fit your product dimensions
Who It Is For
- E-commerce sellers needing a lightweight mailing bag for express and postal dispatch
- Fulfilment and co-packing operations packing high volumes of small parcels daily
- Importers and distributors buying shipping bags to customer size and print design
- Express and mail service agents sourcing poly envelopes for general packaging use
Application
Where This Format Is Used
- Online apparel stores shipping shirts trousers and soft goods in lightweight poly mailers
- Express stations moving documents invoices and small parcels between sorting hubs daily
- Fulfilment warehouses packing mixed e-commerce orders for mailing shipping and packaging
- Exporters consolidating small parts accessories and samples for overseas postal delivery
- Retailers mailing returns replacements and promotional items in resealable style shipping bags
Construction
Technical Features
- HDPE or LDPE mailer film in moisture-proof waterproof transparent or clear construction
- Self seal closure using hot-melt strong adhesive for fast manual sealing without equipment
- Heat-seal welded edge seal for consistent seam strength across the bag width
- Film thickness from 1.2 Mil to 4.0 Mil or 30 Micron to 110 Micron plus custom-made gauges
- Solid base colours with custom printing design strictly followed on the bag face
- Customized size made to client ideas or design for mailing shipping and packaging
Data
Specifications
Figures below are the documented values for this format. Anything not listed is made to your drawing.
| Item | Mailing bags, poly mailer, poly envelope, courier bags |
|---|---|
| Material | HDPE / LDPE / As Per Customer Request |
| Thickness | 1.2 Mil to 4.0 Mil / 30 Micron to 110 Micron / Custom-Made |
| Feature | Moisture-proof, Waterproof, transparent, clear |
| Closure | Self seal with hot-melt strong adhesive |
| Color | White / Grey / Pink / Blue / Red / Purple / Green / Yellow / Orange |
| Printing | Custom printing design will be strictly followed |
| Size | Customized size, follow client ideas or design |
| Edge Seal | Heat-seal welding |
| Application | Mailing, shipping and packagings |
Materials
- HDPE film option for thin lightweight courier bags used in express dispatch
- LDPE film option for flexible poly mailers used in mailing and shipping
- Customer requested film as base material where HDPE or LDPE does not apply
- Hot-melt adhesive strip integrated at the lip for self seal closure
- Printing ink for custom design reproduced strictly to customer artwork on film
Customisation
- Customized bag length and width made to follow client ideas or design
- Film gauge from 1.2 Mil to 4.0 Mil or 30 Micron to 110 Micron or custom-made
- Base colour selected from White Grey Pink Blue Red Purple Green Yellow Orange
- Custom printing design strictly followed for logo text and shipping information
- Material choice from HDPE LDPE or other film as per customer request
In the Factory
How This Format Is Made
- Confirm bag size thickness material and colour against your ideas or design
- Prepare custom printing design for reproduction strictly as supplied by customer
- Convert HDPE or LDPE film to the specified thickness and bag width
- Form the mail envelope body and join edges by heat-seal welding
- Apply hot-melt strong adhesive lip to create the self seal closure
- Pack mailing bags for shipping and packaging use after size verification
Control
Quality Checks on This Run
Trade Offs
Compared With the Alternatives
| Corrugated carton box | Mailers weigh less and store flat but do not protect rigid or fragile goods against crushing |
|---|---|
| Paper mailing envelope | Poly film is moisture-proof and waterproof for wet transit while paper tears and absorbs water |
| Padded bubble mailer | Single film courier bags cost less postage weight but do not cushion sharp or delicate items |
Before You Order
Use Guide
- Send target product dimensions so bag size can be set to your ideas or design
- Select HDPE or LDPE and pick thickness between 30 Micron and 110 Micron
- Choose a base colour or transparent clear film and supply custom printing design
- Confirm flap depth and adhesive coverage needed for your packing station workflow
- State quantity and destination port so quotation follows your exact specification
Answers
Courier Bag / Mail Envelope — Buyer Questions
What materials do you use for courier bags?
We make mailing bags in HDPE or LDPE, or other film as per customer request. Tell us the product weight and transit conditions and we will match the film.
What thickness can you supply?
From 1.2 Mil to 4.0 Mil, which is 30 Micron to 110 Micron, plus custom-made gauges. Thicker film suits heavier parcels and repeated handling.
What sizes and colours are available?
Sizes are customized to follow your ideas or design. Base colours are White Grey Pink Blue Red Purple Green Yellow Orange, plus transparent and clear.
Can you print our logo and shipping information?
Yes. Custom printing design will be strictly followed on the bag face. Send your artwork and required print area with the size specification.
How does the bag close?
Each bag uses self seal closure with hot-melt strong adhesive. Peel the release strip, fold the lip and press to seal without tape.
How are the edges sealed?
Edges are joined by heat-seal welding. This keeps seams closed through express sorting, handling and last mile delivery.
How do I get a quote?
Email material, thickness, size, colour, printing design, quantity and destination port. We quote to your specification rather than a stock list.
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Quote Courier Bag / Mail Envelope to Your Drawing
Send the size or fill volume, film structure, print colour count, quantity and destination port and we will price it properly.